Acoustic Guitar Cases & Gigbags - Ameritage - Martin - Recording King

To determine which size case you need, start by measuring the lower bout of your guitar and looking at the waist. Wide waist guitars are far & away mostly dreadnoughts with either square or slope shoulders, like a Martin D28 or Gibson J-45. For guitars with distinctly narrow waists relative to the upper and lower bouts, let the lower bout measurement be your guide (NOTE: the lower bout specs below are approximate values). The sizes break down as follows: